Add enable-maintenance-reservation flag in slurm to control reservation for scheduled maintenance

[harshthakkar01]

This PR adds enable_reservation_maintenance flag at nodeset level. Slurm would look at nodeset config and decide whether to reserve node for scheduled maintenance or not.

Also, this would ignore running jobs if the it overlaps with the maintenance window and make slurm reservation for maintenance anyway.

For exameple,

  - id: debug_nodeset
    source: community/modules/compute/schedmd-slurm-gcp-v6-nodeset
    use: [network]
    settings:
      node_count_dynamic_max: 0
      node_count_static: 1
      machine_type: n2-standard-2
      enable_placement: false # the default is: true
      allow_automatic_updates: false
      enable_maintenance_reservation: true

  - id: debug_partition
    source: community/modules/compute/schedmd-slurm-gcp-v6-partition
    use:
    - debug_nodeset
    settings:
      partition_name: debug
      exclusive: false # allows nodes to stay up after jobs are done
      is_default: true

  - id: debug2_nodeset
    source: community/modules/compute/schedmd-slurm-gcp-v6-nodeset
    use: [network]
    settings:
      node_count_dynamic_max: 0
      node_count_static: 1
      machine_type: n2-standard-2
      enable_placement: false # the default is: true
      allow_automatic_updates: false
      enable_maintenance_reservation: false

  - id: debug2_partition
    source: community/modules/compute/schedmd-slurm-gcp-v6-partition
    use:
    - debug2_nodeset
    settings:
      partition_name: debug2
      exclusive: false # allows nodes to stay up after jobs are done
      is_default: true

Submission Checklist

Please take the following actions before submitting this pull request.

• Fork your PR branch from the Toolkit "develop" branch (not main)
• Test all changes with pre-commit in a local branch #
• Confirm that "make tests" passes all tests
• Add or modify unit tests to cover code changes
• Ensure that unit test coverage remains above 80%
• Update all applicable documentation
• Follow Cluster Toolkit Contribution guidelines #